悬臂梁
磁铁
材料科学
钕磁铁
压电
联轴节(管道)
磁场
复合数
激发
压力(语言学)
核磁共振
复合材料
声学
电气工程
物理
工程类
量子力学
语言学
哲学
作者
Zhonghui Yu,Zhaoqiang Chu,Jikun Yang,Mohammad Javad Pourhosseini Asl,Zhanmiao Li,Shuxiang Dong
摘要
In this work, we theoretically and experimentally report a NdFeB magnet/piezoelectric composite cantilever with varying stiffness for enhancing magneto-mechano-electric (MME) coupling under weak AC magnetic field Hac excitation. Measurement results show that the MME composite cantilever can produce a relatively high peak-peak output power of 12.8 mW and a peak-peak current of 0.735 mApp under Hac = 7 Oe at a resonance frequency of 36 Hz. Even when Hac is as low as 0.2 Oe, equivalent to the level of the earth magnetic field, it can still drive 4 LED lighting. The obtained results are obviously superior to previous reports, confirming the MME cantilever harvester has potential to harvest the stray magnetic field energy from electrical power cables for continuously powering wireless sensor networks.
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